Light Units Converter Online - Calculate, Transform Solve Illumination Problems

Light, Illumination, intensity Conversion Table and Calculation. Free Light Units Calculator App to convert Units like: Lumen/sq.meter (Lu/m^2), Lumen/sq.centimeter, Lumen/sq.foot, Foot-candle (ft-cdl), Foot-lambert, Candela/sq.meter, Candela/sq.centimeter, Lux (lux), Phot, candle, flame, foot candle, lumen/square centimeter, lumen/square foot, lumen/square meter. decimals for Unit Coversion. Online Free Calculator to solve school homework or engineering problems. Use also .

var property = new Array(); var unit = new Array(); var factor = new Array(); property[0] = "Acceleration"; unit[0] = new Array("Meter/sq.sec (m/sec^2)", "Foot/sq.sec (ft/sec^2)", "G (g)", "Galileo (gal)", "Inch/sq.sec (in/sec^2)"); factor[0] = new Array(1, .3048, 9.806650, .01, 2.54E-02); property[1] = "Area"; unit[1] = new Array("Square meter (m^2)", "Acre (acre)", "Are", "Barn (barn)", "Hectare", "Rood", "Square centimeter", "Square kilometer", "Circular mil", "Square foot (ft^2)", "Square inch (in^2)", "Square mile (mi^2)", "Square yard (yd^2)"); factor[1] = new Array(1, 4046.856, 100, 1E-28, 10000, 1011.71413184285, .0001, 1000000, 5.067075E-10, 9.290304E-02, 6.4516E-04, 2589988, .8361274); property[2] = "Torque"; unit[2] = new Array("Newton-meter (N m)", "Dyne-centimeter(dy cm)", "Kgrf-meter (kgf m)", "lbf-inch (lbf in)", "lbf-foot (lbf ft)"); factor[2] = new Array(1, .0000001, 9.806650, .1129848, 1.355818); property[3] = "Electricity"; unit[3] = new Array("Coulomb (Cb)", "Abcoulomb", "Ampere hour (A hr)", "Faraday (F)", "Statcoulomb", "Millifaraday (mF)", "Microfaraday (mu-F)", "Picofaraday (pF)"); factor[3] = new Array(1, 10, 3600, 96521.8999999997, .000000000333564, 96.5219, 9.65219E-02, 9.65219E-05); property[4] = "Energy"; unit[4] = new Array("Joule (J)", "BTU (mean)", "BTU (thermochemical)", "Calorie (SI) (cal)", "Calorie (mean)(cal)", "Calorie (thermo)", "Electron volt (eV)", "Erg (erg)", "Foot-pound force", "Foot-poundal", "Horsepower-hour", "Kilocalorie (SI)(kcal)", "Kilocalorie (mean)(kcal)", "Kilowatt-hour (kW hr)", "Ton of TNT", "Volt-coulomb (V Cb)", "Watt-hour (W hr)", "Watt-second (W sec)"); factor[4] = new Array(1, 1055.87, 1054.35, 4.1868, 4.19002, 4.184, 1.6021E-19, .0000001, 1.355818, 4.214011E-02, 2684077.3, 4186.8, 4190.02, 3600000, 4.2E9, 1, 3600, 1); property[5] = "Force"; unit[5] = new Array("Newton (N)", "Dyne (dy)", "Kilogram force (kgf)", "Kilopond force (kpf)", "Kip (k)", "Ounce force (ozf)", "Pound force (lbf)", "Poundal"); factor[5] = new Array(1, .00001, 9.806650, 9.806650, 4448.222, .2780139, .4535924, .138255); property[6] = "Force / Length"; unit[6] = new Array("Newton/meter (N/m)", "Pound force/inch (lbf/in)", "Pound force/foot (lbf/ft)"); factor[6] = new Array(1, 175.1268, 14.5939); property[7] = "Length"; unit[7] = new Array("Meter (m)", "Angstrom (A')", "Astronomical unit (AU)", "Caliber (cal)", "Centimeter (cm)", "Kilometer (km)", "Ell", "Em", "Fathom", "Furlong", "Fermi (fm)", "Foot (ft)", "Inch (in)", "League (int'l)", "League (UK)", "Light year (LY)", "Micrometer (mu-m)", "Mil", "Millimeter (mm)", "Nanometer (nm)", "Mile (int'l nautical)", "Mile (UK nautical)", "Mile (US nautical)", "Mile (US statute)", "Parsec", "Pica (printer)", "Picometer (pm)", "Point (pt)", "Rod", "Yard (yd)"); factor[7] = new Array(1, 1E-10, 1.49598E11, .000254, .01, 1000, 1.143, 4.2323E-03, 1.8288, 201.168, 1E-15, .3048, .0254, 5556, 5556, 9.46055E+15, .000001, .0000254, .001, 1E-9, 1852, 1853.184, 1852, 1609.344, 3.08374E+16, 4.217518E-03, 1E-12, .0003514598, 5.0292, .9144); property[8] = "Light"; unit[8] = new Array("Lumen/sq.meter (Lu/m^2)", "Lumen/sq.centimeter", "Lumen/sq.foot", "Foot-candle (ft-cdl)", "Foot-lambert", "Candela/sq.meter", "Candela/sq.centimeter", "Lux (lux)", "Phot"); factor[8] = new Array(1, 10000, 10.76391, 10.76391, 10.76391, 3.14159250538575, 31415.9250538576, 1, 10000); property[9] = "Mass"; unit[9] = new Array("Kilogram (kgr)", "Gram (gr)", "Milligram (mgr)", "Microgram (mu-gr)", "Carat (metric)(ct)", "Hundredweight (long)", "Hundredweight (short)", "Pound mass (lbm)", "Pound mass (troy)", "Ounce mass (ozm)", "Ounce mass (troy)", "Slug", "Ton (assay)", "Ton (long)", "Ton (short)", "Ton (metric)", "Tonne"); factor[9] = new Array(1, .001, 1e-6, .000000001, .0002, 50.80235, 45.35924, .4535924, .3732417, .02834952, .03110348, 14.5939, .02916667, 1016.047, 907.1847, 1000, 1000); property[10] = "Mass Flow"; unit[10] = new Array("Kilogram/second (kgr/sec)", "Pound mass/sec (lbm/sec)", "Pound mass/min (lbm/min)"); factor[10] = new Array(1, .4535924, .007559873); property[11] = "Density & Mass capacity"; unit[11] = new Array("Kilogram/cub.meter", "Grain/galon", "Grams/cm^3 (gr/cc)", "Pound mass/cubic foot", "Pound mass/cubic-inch", "Ounces/gallon (UK,liq)", "Ounces/gallon (US,liq)", "Ounces (mass)/inch", "Pound mass/gal (UK,liq)", "Pound mass/gal (US,liq)", "Slug/cubic foot", "Tons (long,mass)/cub.yard"); factor[11] = new Array(1, .01711806, 1000, 16.01846, 27679.91, 6.236027, 7.489152, 1729.994, 99.77644, 119.8264, 515.379, 1328.939); property[12] = "Power"; unit[12] = new Array("Watt (W)", "Kilowatt (kW)", "Megawatt (MW)", "Milliwatt (mW)", "BTU (SI)/hour", "BTU (thermo)/second", "BTU (thermo)/minute", "BTU (thermo)/hour", "Calorie (thermo)/second", "Calorie (thermo)/minute", "Erg/second", "Foot-pound force/hour", "Foot-pound force/minute", "Foot-pound force/second", "Horsepower(550 ft lbf/s)", "Horsepower (electric)", "Horsepower (boiler)", "Horsepower (metric)", "Horsepower (UK)", "Kilocalorie (thermo)/min", "Kilocalorie (thermo)/sec"); factor[12] = new Array(1, 1000, 1000000, .001, .2930667, 1054.35, 17.5725, .2928751, 4.184, 6.973333E-02, .0000001, .0003766161, .02259697, 1.355818, 745.7, 746, 9809.5, 735.499, 745.7, 69.7333, 4184); property[13] = "Pressure & Stress"; unit[13] = new Array("Newton/sq.meter", "Atmosphere (normal)", "Atmosphere (techinical)", "Bar", "Centimeter mercury(cmHg)", "Centimeter water (4'C)", "Decibar", "Kgr force/sq.centimeter", "Kgr force/sq.meter", "Kip/square inch", "Millibar", "Millimeter mercury(mmHg)", "Pascal (Pa)", "Kilopascal (kPa)", "Megapascal (Mpa)", "Poundal/sq.foot", "Pound-force/sq.foot", "Pound-force/sq.inch (psi)", "Torr (mmHg,0'C)"); factor[13] = new Array(1, 101325, 98066.5, 100000, 1333.22, 98.0638, 10000, 98066.5, 9.80665, 6894757, 100, 133.3224, 1, 1000, 1000000, 47.88026, 47.88026, 6894.757, 133.322); // !!! Caution: Temperature requires an increment as well as a multiplying factor // !!! and that's why it's handled differently // !!! Be VERY careful in how you change this behavior property[14] = "Temperature"; unit[14] = new Array("Degrees Celsius ('C)", "Degrees Fahrenheit ('F)", "Degrees Kelvin ('K)", "Degrees Rankine ('R)"); factor[14] = new Array(1, 0.555555555555, 1, 0.555555555555); tempIncrement = new Array(0, -32, -273.15, -491.67); property[15] = "Time"; unit[15] = new Array("Second (sec)", "Day (mean solar)", "Day (sidereal)", "Hour (mean solar)", "Hour (sidereal)", "Minute (mean solar)", "Minute (sidereal)", "Month (mean calendar)", "Second (sidereal)", "Year (calendar)", "Year (tropical)", "Year (sidereal)"); factor[15] = new Array(1, 8.640E4, 86164.09, 3600, 3590.17, 60, 60, 2628000, .9972696, 31536000, 31556930, 31558150); property[16] = "Velocity & Speed"; unit[16] = new Array("Meter/second (m/sec)", "Foot/minute (ft/min)", "Foot/second (ft/sec)", "Kilometer/hour (kph)", "Knot (int'l)", "Mile (US)/hour (mph)", "Mile (nautical)/hour", "Mile (US)/minute", "Mile (US)/second", "Speed of light (c)", "Mach (STP)(a)"); factor[16] = new Array(1, 5.08E-03, .3048, .2777778, .5144444, .44707, .514444, 26.8224, 1609.344, 299792458, 340.0068750); property[17] = "Viscosity"; unit[17] = new Array("Newton-second/meter", "Centipoise", "Centistoke", "Sq.foot/second", "Poise", "Poundal-second/sq.foot", "Pound mass/foot-second", "Pound force-second/sq.foot", "Rhe", "Slug/foot-second", "Stoke"); factor[17] = new Array(1, .001, .000001, 9.290304E-02, .1, 1.488164, 1.488164, 47.88026, 10, 47.88026, .0001); property[18] = "Volume & Capacity"; unit[18] = new Array("Cubic Meter (m^3)", "Cubic centimeter", "Cubic millimeter", "Acre-foot", "Barrel (oil)", "Board foot", "Bushel (US)", "Cup", "Fluid ounce (US)", "Cubic foot", "Gallon (UK)", "Gallon (US,dry)", "Gallon (US,liq)", "Gill (UK)", "Gill (US)", "Cubic inch (in^3)", "Liter (new)", "Liter (old)", "Ounce (UK,fluid)", "Ounce (US,fluid)", "Peck (US)", "Pint (US,dry)", "Pint (US,liq)", "Quart (US,dry)", "Quart (US,liq)", "Stere", "Tablespoon", "Teaspoon", "Ton (register)", "Cubic yard"); factor[18] = new Array(1, .000001, .000000001, 1233.482, .1589873, .002359737, .03523907, .0002365882, .00002957353, .02831685, .004546087, .004404884, .003785412, .0001420652, .0001182941, .00001638706, .001, .001000028, .00002841305, .00002957353, 8.8097680E-03, .0005506105, 4.7317650E-04, .001101221, 9.46353E-04, 1, .00001478676, .000004928922, 2.831685, .7645549); property[19] = "Volume Flow"; unit[19] = new Array("Cubic meter/second", "Cubic foot/second", "Cubic foot/minute", "Cubic inches/minute", "Gallons (US,liq)/minute)"); factor[19] = new Array(1, .02831685, .0004719474, 2.731177E-7, 6.309020E-05); function UpdateUnitMenu(propMenu, unitMenu) { var i; i = propMenu.selectedIndex; FillMenuWithArray(unitMenu, unit[i]); } function FillMenuWithArray(myMenu, myArray) { var i; myMenu.length = myArray.length; for (i = 0; i < myArray.length; i++) { myMenu.options[i].text = myArray[i]; } } function CalculateUnit(sourceForm, targetForm) { var sourceValue = sourceForm.unit_input.value; sourceValue = parseFloat(sourceValue); if (!isNaN(sourceValue) || sourceValue == 0) { ConvertFromTo(sourceForm, targetForm); } } function ConvertFromTo(sourceForm, targetForm) { var propIndex; var sourceIndex; var sourceFactor; var targetIndex; var targetFactor; var result; propIndex = document.property_form.the_menu.selectedIndex; sourceIndex = sourceForm.unit_menu.selectedIndex; sourceFactor = factor[propIndex][sourceIndex]; targetIndex = targetForm.unit_menu.selectedIndex; targetFactor = factor[propIndex][targetIndex]; result = sourceForm.unit_input.value; if (property[propIndex] == "Temperature") { result = parseFloat(result) + tempIncrement[sourceIndex]; } result = result * sourceFactor; result = result / targetFactor; if (property[propIndex] == "Temperature") { result = parseFloat(result) - tempIncrement[targetIndex]; } var IaDec= Number(document.getElementById('SetDecim').value); targetForm.unit_input.value = parseFloat(parseFloat(result).toFixed(IaDec)) } $(document).ready(function(){ FillMenuWithArray(document.property_form.the_menu, property); var value = ['Light'], el = document.getElementById("PreSelect"); for (var j = 0; j < value.length; j++) { for (var i = 0; i < el.length; i++) { if (el[i].innerHTML == value[j]) { el[i].selected = true; } } } UpdateUnitMenu(document.property_form.the_menu, document.form_A.unit_menu); UpdateUnitMenu(document.property_form.the_menu, document.form_B.unit_menu); var value2 = ['Phot'], el2 = document.getElementById("SelectB"); for (var j = 0; j < value2.length; j++) { for (var i = 0; i < el2.length; i++) { if (el2[i].innerHTML == value2[j]) { el2[i].selected = true; } } } CalculateUnit(document.form_A, document.form_B); }); function AratPreSel(){ var elem = document.getElementById('PreSelect'); elem.style.display = 'inline'; document.getElementById('PreSelX').style.display = 'inline'; } function AscPreSel(){ var elem = document.getElementById('PreSelect'); elem.style.display = 'none'; document.getElementById('PreSelX').style.display = 'none'; } function CurataInp(){ var IaInp= document.querySelectorAll('.InpNr'); for(var i = 0; i < IaInp.length; i++) { IaInp[i].value=''; }; } function CopieConv() { var copyText = document.getElementById("InpNr2"); copyText.select(); copyText.setSelectionRange(0, 99999); navigator.clipboard.writeText(copyText.value); alert("Copied: " + copyText.value); }

Decimals:

Based on the brightness seen by the human eye, light can be quantified subjectively. Candles, lumens, footcandles, and lux are examples of units. If the output of a source of light resembles that of a "standard candle," then that source has a luminosity of one candle.